Sunderland have made an improved bid for Dynamo Kiev forward Jeremain Lens, sources have told ESPN FC.
As revealed by ESPN FC last month, Sunderland had made a move for Netherlands international Lens as they look to bolster their attacking options.
Sunderland boss Dick Advocaat is determined to bring in attacking reinforcements ahead of the new season and he had lined up a move for his fellow Dutchman.
Advocaat is a big fan of Lens, having worked with the attacker when the pair were together at AZ Alkmaar and PSV Eindhoven.
Lens, 27, is an AZ Alkmaar youth graduate who moved to PSV Eindhoven in 2010 and scored 34 goals in 96 Eredivisie appearances. He joined Kiev in 2013.
Lens is open to leaving Ukraine this summer, but Kiev have rejected Sunderland's first offer which sources say was in the region of £8 million.
Sunderland have now returned with a new offer and they are confident that this bid will be accepted by Kiev.